Welter would be very interesting. Floyd (if he would do it), Cotto, Mosely, Cintron, Berto, and Clottey.
I couldn't see this coming together anywhere else, at 168 it's so unclear who the champ is, and even after this there will be a question because Bute isn't in the mix. Also 168 didn't have as big of egos, at 147 Floyd would never be down with fighting the bestin his own division.
126, john,gamboa,luevano,lopez,cabellero,marquez,vasquez. that would be kick ass, come on hbo it is a winner
Id go with welter weight,it would be huge . In fact i think boxing as a sport would go up even with the mainstream,especially if they did it in all divisions.
What about the littlier divisions? There would be probably grade A class wars and most of those guys haven't got the main stream attention that they so much desire.
WW....... Berto Cotto mayweather Mosley and then you have many possibles. Collazo, Clottey, PW if he can still make it @ WW, Pacquaio if hes game
140 could put together a good 4-man tourney (without Pac, who'd never be down with it). Problem is, Khan/Warren would likely never go along either. I'm thinking Khan/Akexander/Bradley/Maidana. I'm assuming Hatton would pass.
That is nothing to cough at. Those probably would be some grade A class fights and be entertaining as hell.
A tournament could also be set up for mega Championship fights. A eliminator for contenders. Just a thought